Igneous Rocks Quiz
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Questions and Answers

What is the process called when magma cools and crystallizes to form igneous rocks?

  • Solidification
  • Crystallization (correct)
  • Petrification
  • Mineralization
  • What determines the type of crystals formed in igneous rocks?

  • The color of the magma
  • Atoms and molecules contained in the magma (correct)
  • The location of the magma
  • The rate of cooling
  • Where can igneous rocks be formed?

  • Above or below Earth's surface (correct)
  • Only above Earth's surface
  • In the Earth's mantle
  • Only below Earth's surface
  • What is the meaning of the word 'igneous'?

    <p>Fire</p> Signup and view all the answers

    What are the two types of igneous rocks mentioned in the text?

    <p>Intrusive and extrusive igneous rocks</p> Signup and view all the answers

    What is magma?

    <p>Molten rock under Earth's surface</p> Signup and view all the answers

    What are igneous rocks formed from?

    <p>Magma cooling and crystallizing</p> Signup and view all the answers

    What type of rock is granite?

    <p>Intrusive</p> Signup and view all the answers

    What type of texture does obsidian have?

    <p>Glassy</p> Signup and view all the answers

    What type of texture is characterized by two distinct sizes of minerals?

    <p>Porphyritic</p> Signup and view all the answers

    Which rock contains a large amount of feldspar and quartz?

    <p>Granite</p> Signup and view all the answers

    What is the silica content in mafic rocks?

    <p>45 to 55%</p> Signup and view all the answers

    What type of rock is peridotite?

    <p>Ultramafic</p> Signup and view all the answers

    What causes the bubbly texture in rocks like pumice?

    <p>High water and gas content</p> Signup and view all the answers

    What type of cooling process results in aphanitic texture?

    <p>Fast cooling</p> Signup and view all the answers

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